qianp2k wrote: Better on what? Unless you can show us the final result why we should believe you not DXO and Digital-Picture labs? Sure Nokia can jam 41mp into its 808 cellphone. But what crappy IQ comes out it

Deflection and avoidance of the question, which was could the 17-55/2.8 EF-S produce a better result on a 60D than a 24-70/2.8L. the answer is clearly 'yes'.

That is exactly you did. You are avoiding the question I asked specifically that does that APS-C combo has better IQ than 24-70L on 5D2 not on the same 60D assuming I can fit the subject into the same portion of frame? Do DXO and Digital-Picture labs test clealy show 5D2 combo is better as I quoted earlier?

OK, my bad. Lost track of where we'd been. HKfreelancephotographer found that his 17-55/2.8 on his 60D was sharper than his 24-70 on his 5DII, and I said this could happen. You say it couldn't. Since he posted evidence of it happening, he seems to have one over on you.